President George W. Bush greets shuttle astronauts from right, Peggy Whitson, Stephanie Wilson, and John Grunsfeld, and Ellen Ochoa at NASA headquarters in Washington, D.C., Wednesday, Jan. 14, 2004. The President committed the United States to a long-term human and robotic program to explore the solar system, starting with a return to the Moon that will ultimately enable future exploration of Mars and other destinations.